Attachment for machine tools for turning and boring irregular surfaces



Feb. 14, 1928. 1,659,385 Y J.. J. N. VAN HAMERSVELD uncmwnr r oRuAcnINE TOOLS FOR TURNING AND BORING IRREGULAR SURFACES Filed 001:.10, 1925 e Shee ts-Sheet 1 Feb. 14, 1928. 1,659,385

J. J. N. VAN HAMERSVELD ATTACHMENT FOR momma TOOLS FOR TURNING AND BORING IRREGULAR SURFACES Filed Oct-10, 1925 6 Sheets-Sheet 2 6N0: wars Feb. 14, 1928. 1,659,385 J. J. N. VAN HAMERSVELD ATTACHMENT FOR MACHINE TOOLS FOR TURNING AND BORING IRREGULAR SURFACES Filed 0012.10, 1925 6 Sheets-Sheet 3 w Nv mrw .JMWW I attouwg Feb. 14, 1928.

J. J. N. VAN HAMERSVELD ATTACHMENT FOR MACHINE TOOLS FOR TURNING-AND BORING IRREGULAR SURFACES Filed Oct.l0, 1925 6 Sheets-Sheet 4 NEH? I Feb. 14, 1928. 1,659,385

- J. J. N. VAN HAMERSVELD ATTACHMENT FOR MACHINE ,TQOLS FOR TURNING AND BORING IRREGULAR SURFACES Filed 0015.10, 1925 6 Sheets-Sheet 5 I Q glwuantoz Quanta-o j Feb. 14, 1928.

J. J. N. VAN HAMERS'VELD ATTACHMENT FOR MACHINE TOOLS FOR TURNING AND BORING IRREGULAR SURFACES Filed 0ot.l0, 1925 6 Sheets-Sheet 6 "ll-Ill Patented Feb." 14,

.- *UNITED' STATES 501m .1. n. VAN rrmnnsvnnn, or cnnvnnaun HEIGHTS, onro, ASSIGNOR To THE "PATENT OFFICE.

WARNER AND Sw-ASEY COMPANY, OF CLEVELAND, OHIlO, A. CORPORATION OF OHIO.

ATTAcnmnnT on MACHINE TooLs FOR TURNING AND nonme- IRREGULAR SUR- raons.

- Application. filed October 10, 1925. Serial No. 61,663.

F This invention relates to machine tools and has 'for its chief object the provision of a machine tool, or of an attachment for tools of standard construction, said machine tool or attachment being adapted for turning or boring a. surface which is irregular either longitudinally or laterally of the axis of the machine. tool, or laterally thereof.

More particularly, it is the aim of the invention toprovide. means whereby a surface maybe turned on the exterior of the work, or may be bored on the interior, which surface in cross-section may be oval or other-. wise non-circular in cross-section, and which may be straight, tapered or otherwise irregular in shape longitudinally considered.

Further the invention aims to accomplish the above with mechanism which enables the quick conversipn or change in set-up by which the machine can be readily changed from a condition of turning to one of boring, and vice versa.

A still further object is to provide means whereby the boring and turning operations for a surface requiring a change in location of the turning or boring portion of the tool during the cutting operation, and which in the embodiment herein illustrated is brought about by anoscillation of the tool-holder, mav be accomplished with great rapidity,

and with great steadiness of the parts, which permits accurate work to be done.

A still further object-is to accomplish the above by means of an attachment which can be very readily and quickly applied to or reriiloved from a machine tool such as a turret lat e.

The above and other objects are attained by my invention which may be here briefly summarized as consisting in certain novel details of constructiomand combinations and arrangements of parts which will be de scribed in-t-he specification and set forth in the appended claims.

In the accompanying sheets of drawings wherein I have illustrated the preferred embodiment of my invention for use in both turning and boring surfaces which are oval, and therefore non-circular in cross-section, and which are tapered longitudinally or axially. Fig. 1 is a side elevationshowing a poIiZiOH Of the bed, head and turret both longitudinally and of a standard turret lathe with the head and turret equipped with my improvements adapted for the purpose above stated; Fig; 2 is an enlarged view of the head portion of the machine with parts in section along the irregular line 2-2of-Fig. 3, looking in the direction indicated. by thearrows; Fig. 3 is a sectional View substantially along the line 33 of Fig. 2, looking in the direction indi-' cated by the arrows; Fig. 4 is an enlarged side view of a portion of the turret end of the machinewith parts in section; Fig. 5 is an inside face view of the same with the bed of the lathe in section; Fig. 6 is a detail sectionalview substantially along the line 6-6 of Fig. 4'; Fig. 7 is a view similar to Fig. 1, but with the turret and turret slide moved substantially the maximum distance toward the head, parts being in section: Fig. Sis a sectional view substantially along the line 8-8 of Fig. 7, looking in the direc tion indicated by the arrows; Fig. 9 is a horizontal, sectional view substantially along the line 99 of Fig. 5; Fig. 10 is a detail view showing the work and tool employed for turning instead of boring, as illustrated in the preceding figures; Figs. 11 and 12 are respectively a side elevation and an end view .of a cam member used for actuating the toolholder. in boring an oval, tapered opening; Figs. 13 andlt are respectively a side elevation and an end View showing the stock or work-piece preparatory to the boring operation; Figs. 15 and 16 are respectively a longitudinal sectional view and an end view of the finished work after the completion of the boring operation by which a tapered,

oval opening is bored; Figs. 17 and 18 arerespectively a side elevation and an end view of a cam used in turning an oval, tapered surface; Figs. 19 and 20 are respectively a side elevation and an end view of the stock or work-piece prior to the turning opera-.

tion; Figs. 21 and 22 are similar views of the work-piece after the same has been turned to a tapered oval; and Fig. 23 is a detail sectional view substantially along the line 23-23 of Fig. 4.

As stated in the early part of the specification, although my invention may be cmbodied in a special machine tool, it may be, andpreferably is in the form of an'attachment to standard machine tools, and inthe as the spindle, the gear 321's, of course, of

which supports the tool be attached to the turret, but in. the present einbodiment, that method of tool supporting is em loyed.

The attachment in sofaras e head is concerned, is associated with a suitable work-holding chuck 28, attached to the spindle 26 of the head. The details of the chuck are. immaterial to my invention, a chuck of the draw-back type being illustrated, which chuck isof standard form, except that the front collar is replaced by a gear sleeve 28.

The portion of the attachment which is applied to the head includes a bracket 29 which is secured by bolts 30 to the spindlebearing cap 26 of the head. This bracket extends upwardly and laterally toward the rear side of the machine, and has a portion overhanging. the chuck, as well illustrated in Figs. 2 and 3. The outer upperportlon of this bracket has bearing portions 29 in which is rotatably supported a camshaft 31 which extends axially of the machine, above and to the rear side of the spindle of the head. This shaft is rotated in predeter mined timed relation with respect to the rotation of the spindle and chuck, and pref-e erably at the same speed as the chuck is rotated, this being brought about by a gear 32 keyed to the shaft 31,.and an idler gear 33whieh meshes both with the gear 32 and with the gear sleeve 28", the idler gear33 being supported in 0. depending portion or arm 29 of the bracket 29; To cause the cam-shaft 31 to be driven at the same speed the same diameter'as the gear sleeve 28.

Secured to cam-shaft 31 is a cam 34, which is instrumental in oscillating the tool-holding member to be referred to presently. The cam 34 is removably secured to cam'shaft '31, and may 'be held thereon in any suitable manner, but in this instance, and preferably, the rear end of the cam is provided with projecting lugs 34' (see Figs. 2, 11, 12, 17 and 18) which lugs fit into a pair of deprcs'sions in a slightly enlarged portion 31 of cam-shaft 31, and is pressed against the same by a nut 34", threaded onto the shaft and engaging the front end of the cam.

Itistobenotedthatthecamisthusflocured to the shaft some distance'rearwardly of its forward end, this being important for the reason that the shaft is employed'not -is important that the cam a boss or lug on the slide.

only to support and rotate the cam, but it has the equivalent of apilot bar function, as

will be explained presc'ntlv, for the purpose of steadying the cam.

It might be here mentioned that while it be held rigidly or fixedly on the shaft, it is ually important that it be readily removab e to adapt the attachment for both turning and boring, or for the The attachment in so far as the tool-holdlng portion is concerned, includes a bracket 35, which in this case is secured to one of the faces of the turret 27 in the usual manner. The bracket 35 is provided with a .stud 35 which is rigidly secured to the bracket and projects toward the head.

production of differently shaped work-pieces.

Mounted on this stud through the mediumv of anti-frictionbearings 36, is an oscillator tool-carrying member 37, having a too carrying portion 37, and an upwardly and laterally projecting arm 37". provided at its outer end with a roller 38 adapted to engage the surface of the cam34.

The tool-carrying portion 37 of the oscillatory member is provided on its side facing the head, with a slide 39, to which is secured in any suitable manner a cutting-tool 40. Int-his instancethe-cutting tool is clamped by means of a set-screw 41 into an opening of the slide.

The slide is adaptedto be adjusted up and down by means of an adjusting screw-42, which is held in the tool-carrying portion of the oscillatory member, as illustrated in Fig. 7, this screw being provided with a handle 42 and having a threaded en agement with Every fine adustment is permitted, particularly by reason of the fact that the screw is provided with a graduated collar" 42".

After the slide has been adjusted to bring the cutting-portion of the tool to the right elevation, it is important that the slide be accomplished in this instance by a special I lockmg provision including a holding-screw 43, which has a threaded engagement with a forwardly projecting lug 37 on. the toolcarrymgportion of the oscillatory member,

the upper end of this screw bearing against the lower side of a laterally projectng lug 33 of the slide, this screw preventmg the slide 33 from moving downwardly. A. second holdm screw 44 is provided to hold the slide a nst moving upwardly, this screw 8 oosely, or .with a clearance throng the ug 39, and having a shoulder at the up 1: end which rests on top of this it is. threaded "in the. lower lug 37 of additionalmovement 0 the slide, due to vibratiompro pscillatorymember. As" precaut on against accidental such. as brass, so that when forced inward ly it will not damage the threads of the screws which it engages.

It will be seen, therefore, that when itis desired to lower the slide with the tool, the

till

locking-screw is backed away, the holding-screw 43 is lowered, whereupon the slide can be moved downward the right distance by turning the screw 42, after which the screw 44 is lowered until the shoulder at the upper end thereof engages the lug 39, and screw 43 is elevated until its upper end engages the lower side of lug 39, after which the locking-screw 45 is tightened to lock both screws 43 and 44 in position. If it is desired to elevate the slide and the tool, screw 44 is elevated after the locking-screw 45 has been released, and after the slide has been raised by turning the screw 42, screw 44 is lowered until the shoulder at the top thereof engages the-upper side of lug 39, and screw 43 is raised until it engages the lower side of the lug 39*, after which, screw 45 is tightened to again lock the holding-screws 43 and 44in position. The position of the tool will be changed not only when the operation is changed from boring to turning and vice versa, but also in either boring a hole or turning an outer surface when considerable stock is to be removed, necessitating both one or more roughing out cuts and a finishing cut.

llt will be observed, particularly from supported atthe rear side of the bed, or

till

till

rearwardly of the work-piece, it isobvious that the cam acting through the roller38 and arm 37", positively feeds the tool inwardly to the work. To cause the roller 38 to keep in engagement with the surface of the cam at all times, and particularly when the tool is receding from the axis of the work, a spring is employed, which spring is preferably carried in a barrel-likeextension 35' of the bracket 35, the spring being shown in Fig. 4, and designated 47. As shown in this figure, the spring at the top bears against. a shoulder atthe upper part of the barrel, and at its lower end it bears against ashoulder of a plunger 48 extending through the barrel and spring, and at its lower end, beneath the barrel, having a reduced portion 48 engaging in a slot of a l .g

37 at the lower end of the tool-carrying por-' tion 37 of the oscillatory member 3'Z. will be noted that above and below the lug ing cut on the work-piece, it is obvious that heavy stresses are transmitted from the cam to the tool-holding member, making it important that the, cam-shaft 31 be steadied in order that accurate work may be done. This is accomplished by my invention by giving the shaft 31 a pilotbar function, the eflect of which is to steady the shaft and hold it in parallelism with the axis of the machine while the heaviest outs are being made. and, in fact,'duriug all cut-ting conditions. Toaccomplish this, the bracket 35 is provided with an arn1 35, projecting upwardly and toward the rear side of the machine. and inthe upper end of this arm I mount a bushing 49 which-is so positioned, and the bore of which is of such a size, that when the turret moves forwardly this bushing receives the portion of the shaft 31 projecting beyond the cam 34, so that the shaft will be supported at both ends whenthe cutting tool is in action, as well illustrated in Fig. 7. In order that the bushing may be in strict alignment with. the shaft 31, and also to compensate for any wear which maybecur, or slight irregularities in positioning when the attachment is set up, the bushing is adjustably mounted in the arm 35", preferably through a-series of equally spaced setscrews 49 (see Fig. 23). The bushing 49 is provided at its end facing the head. with a shoulder 49*, which is adapted to be brought up against the face of the arm by a nut 49". adapted to be screwed onto the opposite end of the bushing, as clearly illustrated in Fig. 4.

The shape of the cam which oscillates the 'While my invention is adapted for both in ternal boring and external cutting, and may be utilized in the production of work-pieces having a variety of shapes or forms, internally and externally, I have, .by way of ex ample, illustrated in .Figs. 15, 16, 21 and 22, two different products or work-pieces, one consisting of a d e 50, having an internal bore 50, which is 'bothoval in shape transversely considered, and tapered longi-:

tudinally. and a punch 51 with an external surface 51, which is oval in cross-section, and is reversel tapered, as illustrated. It

37, the plunger has rounded seats which enmight be ment oned that the punch and die here illustrated, are adapted to be used together in a punch press to punch elongated or oval-shaped openings in steel plates and the like Additionally I have illustrated in Figs. 11 and 12 a: cam which is employed in the production of the die of Figs. 15 and 16, and in Figs. 17 and 18, a cam is utilized in the production of the punch 51, shown in Figs. 21 and 22. It might be stated also, that the cam 34 of Figs. 11 and 12 is the same cam-illustrated in the preceding figures, and that the die shown. in'Figs. 15 and i 16 is illustrated in a. partially completed state in some of the preceding figures referred to in describing the machine.

The die 50, may be formed from bar stock 50*, fed through the work spindle of the machine, andadapted to be clamped in a0 the cam .34, which as before stated, turns at the chuck. To produce a'die of the appropriate length, a given length of the bar. 1s

first given a straight internal bore as in-' dicated at 50, by drilling, and then the hole is bored and the, outer surface is turned (see Fig. 13).- The drilling of the hole, the boringof the same and the'turning of the outer surface are accomplished by standard tools T, T and T carried by the turret, asindicated in Fig.- 9. of this invention is brought into play and the oval and tapered opening is bored with the speed of the work-piece and rapidly 0s cillates the'tool. It will be-noted that the cam 34 is provided on the outer end with a short.tapered-portion 34, which leads u to the tapered and oval surface 34, whic is the active surface engaged'by the roller 38 while the cutting is taking place, the shape of this portion being such as to cause the boring, tool to cut or bore an oval tapered surface of the. desired shape in the work-piece 5.0. v

After the boring operation is completed, the piece is cut from the bar by any suit able tool, along the line 50.

The unches 51 may also be formed from round ar stock 51, illustrated in Figs. 19 and 20, and in forming these punches 51 Y a cam, illustrated at 34' in Figs. 17 and 18,

is employed. This cam .is provided with a tapered surface 34, up. along which the roller rides in reaching the oval and tapered surface 34, appropriately shaped as to crosssectional outline and taper, to form the 'ovalshaped and main ta ered part of the punch, this surface 34' oft e cam being contiguousto an oval-shaped but oppositely tapered face 34 of the cam, this being utilized in forming the relatively short and reversely tapered part of the punch.

It is to be noted 'that'in' hanging from an internal boring operation tozan-external turning operation, as illustrated in Figs. 7 and 10, the slide is" lowered and then looked inposition in the manner previously ex- Then the attachment plained, so as to bring the cutting point of the tool under the work, as illustrated in Fig. 10, and, ofcourse, in changing from one operation to the other, the cam utilized in boring is removed from shaft 31 by removing the nut 34", and is replaced with a cam appropriate for the external turning operation. The two changes above referred to, i. e. the changing of the position of the tool and the changing ofthe cams are all.

that is necessary to adapt the machine for either operation, and as these changes can be effected quickly, the machine is efiicient in the respect that there is little loss of time in the conversion.

The particular way in which the tool holder is mounted, and the manner in which it is oscillated are also important factors in the high efficiency of the machine. The fact that t 1e tool and its adjustable slide are mounted on an oscillating supporting mem her, in turn journaled through the medium of anti-friction bearings, and the fact that the tool is positively fed into the work through the action of the rotating cam acting on the roller, which is maintained in contact with the cam by a spring 47, enables a very high turning speed to be maintained,

and an exceedingly rapid oscillatory movement imparted to the tool-holder without vibration or chattering. These features admirably adapt the machine for operatin on material such as aluminum and brass, w ich require a high cutting speed for satisfactory results and efficiency. Furthermore, the

fact that the rotating shaft supporting the cam which oscillates the tool has its outer end supported in a manner similar to a pilotbar, and enables the cam and its supporting shaft to effectively resist the back pressure of the roller incident to the taking of a deep out, particularly an eccentric out, as is the case in producing articles such as herein illustrated, is responsible to an important degree in the efliciency of the machine from the precise details or arrangements shown, and it is understood also, that while I have illustrated the machine and described it in connection with'the production of Specific articles, it is to be understood that the machine may be utilized for producing" other articles or workieces than those described, and work-pieces 'iferently shaped. I therefore aim in my claims to cover all modifications which do not involve a departure I slide,

thereby said shaft being held against endwise movement, a cam carried by the shaft, a movable member carried by the slide and provided with means engaging the cam and with a portion for receiving a tool.

2. A machine tool having a bed provided with a head having a spindle and 'with a a shaft carried bythe head in para} lelism W1l3hl3l18 spindle and having a driv a braclret carryinga-shaft held irom endwise movement therein and provided vvitha cama gear train connecting said fixed thereto,

shaft to the spindle, an attachment for the slide comprising a bracket provided with oscillatory member tuatin shaft with sliding i;

having a roller adapted to engage the cam, and having a work cutting tool.

at. A machine tool having a a head and a slide on the bed, a rotatable member carried by the head, an oscillatorymember carried b the slide, a rotatable cam for acby the head and adapted to have sliding engagement with said shde. a

5. A machine tool having a bed and two members, one havingnr rotatable part and. the other having an oscillatory part, one of said parts adapted to receive the virorlr and the other a tool, a rotary cam for actuating Y the oscillatory part, a shaftfcarrying said on one of said members,

cam and supported 7 g v the'other member adapted to receive the 6. A machine tool aving a mg connection with the latter, a cam carried e oscillatory member, and a rotat- .able s aft carrying said cam, said shaft be-- ing carried members, one havingoa rotatable part and the other having an oscillatory part, one of said parts adapted to receive the work and the other a tool, a rotary cam for actuating the oscillatory part, a shaft carrying said cam and supported on one of said members, a device on the other member adapted to receive the shaft with sliding engagement, and means for adjusting said device so as to bring it into alignment with the shaft.

"1'. A machine tool having a bed, a head and asliding member on the bed, a rotatable part carried by the head, an oscillatory part carried by the sliding member, means for oscillating said part, a slide on said oscillatory member adapted to carry a tool, means for. adjusting the slide, and means for locking the slide against accidental movement. a

8. A machine tool having a bed, a head and asliding member, on the bed, a rotatable part carried by the head, an oscillatory part carried'by the sliding member, means for oscillating said part, a slide on said oscillatory part and adapted to be provided with a tool, means-foradjusting said slide, adjust-able abutment means for locking the slide 'in predetermined position, and means for looking said abutment means against 'movementJ '9; An attachment foramachine tool hava sliding member, said attachment comprismg a rotary shaft having'a cam and adapted to be applied to theheadrin parallel relation bathe spindle and tobe rotated by the spindle, and an oscillatory-member ada ted to prov'idedwith a cutting tool an to be secured to thesliding member said member having a part adaptedto engage said cam.

10. A machine having a bed, awork carry ing member with a rotary spindle, and a tool carrying member, one slid'able' from the other, a cam the spindle, and rotated thereby, a movable tool holder carried by the tool carrying memberand provided with a follower engaging towards and located laterally of 7 ing a. head "with a rotating spindle, a bed and the cam and having a movement-relat1ve to the cam lengthwise thereof during the relafltive sliding movements between the work and tool carrying members.v 7 7 V In testimony whereof, I hereunto afiix my V signature. 7 V r a bed and twp JOHILLH. HALIERSYELD. 

